x Turn on thread page Beta
 You are Here: Home >< GCSEs

# Help with these two maths trig questions please? watch

1. I'll link an attachment below and I'll explain what I've done so far

For the 1st 2 marker question I understand the opposite angle is 73 degrees because it's isocles and that's all I've gotten.
However on question 2 I've wrote so far...
(not sure if its correct)
all angles are 60 degrees in the triangles and the sides are 10. So I should half the rectangle into a right angled triangle and the side would be 20 cm and the angle 90 degrees and use tan?
but that's where im stuck
please explain and offer me guidance
Attached Images

2. (Original post by AlphaNick)
1)
You're correct so far, ∠ACN (assume N is the midpoint of length X) is equal to 73°
You should then realise that it is possible to work out length x with the trigonometry equations:
$sin(x)=\frac{opposite}{adjacent}$
$cos(x)=\frac{adjacent}{hypotenuse}$
$tan(x)=\frac{opposite}{adjacent}$
Since you have the hypotenuse and the angle, and you're trying to work out the adjacent side, you should use the second equation listed.

Rearrange it to get:
$adjacent=cos(x)\cdot hypotenuse$ (the dot means times by)

So do cos(73)*9

Then remember to double it to find the total length of x.

2)
Yeah, all angles in that upper triangle are 60°
90-60=30
So you should now have an angle of 30° and a side of 19cm, use the third equation I listed previously to work it out.

is 1) = 5.2 cm correct
and 2) = 22 cm correct??
3. (Original post by AlphaNick)
1 should be 5.26, so it would round to 5.3 at 2sf, be careful there but it looks fine.

2 I got 32.9 cm, check again
I agree

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: July 29, 2014
Today on TSR

### Happy St Patrick's day!

How are you celebrating?

### Stay at sixth form or go to college?

Discussions on TSR

• Latest
Poll
Useful resources

## Study tools

### Essay expert

Learn to write like a pro with our ultimate essay guide.

See where you can apply with our uni match tool

### Make study resources

Create all the resources you need to get the grades.

### Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

### Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

### Find past papers

100s of GCSE past papers for all your subjects at your fingertips.

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE